Money is money too. Increasing contexts costs non zero money, even with cache hits. Also context rot is a problem that subagents help with

This truism is intuitive to everyone but always funny to me how everyone never has any time, needs to save time, needs to hire staff workers for every mundane job and robots can't come soon enough… all so we can binge watch Game of Thrones and 90 day Fiancé.

And watch 10 hours of football on Sunday for our DraftKings bets.

Money is also money, which anyone who makes heavy use of parallel subagents will quickly learn.

> Time is money. Parallelism is very helpful optimising one to get the other.

Parallelism is fantastic when it actually speeds up the entire pipeline, but in my experience most people's jobs (at least the ones for which AI is currently relevant) involve a lot of overlapping "hurry up and wait" branches that drastically blunt the real benefits of that sort of parallelism.

There may be specific situations where it makes sense to do it, but just immediately going full gastown on anything AI related seems like such a giant waste to me, of both money and finite world resources.